build.js

const Metalsmith = require('metalsmith');
const markdown = require('metalsmith-markdown');
const layouts = require('metalsmith-layouts');
const collections = require('metalsmith-collections');
const permalinks = require('metalsmith-permalinks');
const handlebars = require('handlebars');
const fs = require('fs');

// Navigation
handlebars.registerPartial('navigation', fs.readFileSync(__dirname + '/layouts/partials/navigation.hbt').toString());

Metalsmith(__dirname)
  .source('src')
  .destination('public')
  .use(collections({
    articles: {
      pattern: 'articles/*.md',
    },
  }))
  .use(markdown())
  .use(permalinks({
    pattern: ':collection/:title'
  }))
  .use(layouts({
    engine: 'handlebars',
    directory: './layouts',
    default: 'article.html',
    pattern: ["*/*/*html", "*/*html", "*html"],
    partials: {
      navigation: 'partials/navigation',
    }
  }))
  .build(function (err) {
    if (err) {
      console.error(err)
    }
    else {
      console.log('build completed!');
    }
  });